a and b are two numbers selected randomly from 1,2,3.... 25 what is the probability of a and b are not equal.
(a) 1/25
(b) 24/25
(c) 13/25
(d) 2/25

• No of events=625((1,1),(1,2).......(25,25))
  Probability of getting a&b are equal=(25/625)[(1,1),(2,2),(3,3).....(25,25)]
  Probability of a and b or not equal=1-(25/625)
  =600/625
  =24/25
• 13 years agoHelpfull: Yes(54) No(3)
• 24/25
  
  a and b are two numbers selected randomly from 1,2,3.... 25.
  
  a can be any number out of 25 numbers.
  For b, there are also 25 options from 1 to 25 .
  but as according to question b is not equal to a, there are 24 options out of 25.
  so the probability of a and b are not equal is 24/25.
• 13 years agoHelpfull: Yes(20) No(5)
• 24/25
  
  a and b are two numbers selected randomly from 1,2,3.... 25.
  
  a can be any number out of 25 numbers.
  For b, there are 25 options from 1 to 25 .
  For and b not equal, there are 24 options out of 25.
  so the probability of a and b are not equal is 24/25.
  
• 13 years agoHelpfull: Yes(7) No(3)
• if a and b are to be equally selected frm d numbers then the probability is 1/25
  and it is given that the numbers must not be equal then the required probability is =1-1/25=24/25
• 13 years agoHelpfull: Yes(6) No(1)
• we can have 1st no from 1to 25
  then we have only 24 option out of 25 for selecting 2nd no
  so prob=24/25
• 13 years agoHelpfull: Yes(0) No(2)
• Pls check this qn. How many 4 or 5 digit numbers can be formed by using 0, 1, 3, 5, 8. Repetition is not allowed. None of the given options is correct. No. of 4 digit nos that can be formed by using 0, 1, 3, 5, 8.( Repetition is not allowed.)=4*4*3*2=96 No. of 5 digit nos that can be formed by using 0, 1, 3, 5, 8.( Repetition is not allowed.)=4*4*3*2*1=96 Total No. of 4 digit or 5 digit nos that can be formed by using 0, 1, 3, 5, 8.( Repetition is not allowed.)=96+96=192
• 13 years agoHelpfull: Yes(0) No(10)